You may or may not be a huge Metallica fan - if you are, you already love this song. You might not even be a major consumer of heavy metal - but if you do, you've heard this one. But probably everyone with a serious workout playlist should give Metallica a chance. The artistry of this one - it's positively symphonic - is great; and, as always, the energy is unrivalled.

Swing that waist-length hair around. And get thrashed.